Process of dyeing cellulose derivatives



Patented Nov."

NI ED "STATES ;nnmz nrcnwnnn, Enron Freeman; AND

HAIR, GEBHANYQ ASSIGNOBS IO GBASSELLI DYESTUFF GOBPOBATIO YORK, N. Y., A. CORIORATION OF DELAWARE.

Flues,

can]: ERICK man, or nocnsr-oN-rimn, or Haw PATENT o PROCESS OF DYEDIG CELLULOSE DERIVATIVES.

. Io pawns. Application Med December as, 1925,

Our present invention relates to a process for dyeing cellulose derivatives, especially cellulose esters or ethers. For purposes of this invention we will call such cellulose derivatives compounds of the group includ- .ing cellulose esters and cellulose ethers. We

have found that for this purpose monoazo dy'estufi's, containing as coupling component an ortho-aminophenolether or a homologue '10 or substitution product thereof capable ofbeing coupled, are eminentl suitable. The diazo compounds to'be' usec may be of any kind, but they must not contain more than one single sulfo group. As all the dyestuffs 1 in question still have a free amino group,

they may,-of course, also'be dia'zotized directly on the fibre and subsequently treated in the usual manner by a developing agent. The following. examples serve to il ustrate pur invention:

(1) 1 kilo of acetate silk is dyed for to 1 hour at (SO-70 C. in a d e-bath of -25 litres in which 20- grams 0 thedyestufizflchlorobenzene-5-sulfonic acid-1-azo-3-amino- 26 'MreSOI-methylether Y 101 0011,; CH, =3=4:1) having mostvprobably the formula: 1 01 w 0cm gran NE:

on! m I is dissolved, with or without the addition 10f a salt or acid or with or without the admost one sulfo Serial m. 17,399, and-1n Germany m a, 1m.

4-cresolmethylether are dissolved, either in the form of its'hydrochloride or in a 001- B0 loidalform, in presence or absence of a salt. In th1s manner a beautiful orangetint of good fastness is obtained.

When usin lthe'dyestufi: B-nitrobeniene- I 4-sulfonic aci -l-azo-4-chloro-2-amino-l-phenolmethgzlether, a deep golden-yellow tint is obtaine whereaswthe dye'stufl: 2-methylbenzene-5sulfonic acid-1-azo-3 amino 4-cresolmethylether gives a pure greenish-yellow tint.

In the following claims we understandby the; term ortho-aminophenolether also the homologues or substitution products of this compound in so far as they are ca able of be g coupled with diazo compoumgi 4 e claim:

Process of. dyeing compounds of the gr up including cellulose esters and cellu-. lose ethers consisting in using for the dyeing prdgeess monoazo dyes obtainable by coupling group including cellulose esters and celluse ethers consistin in using for thedyeing 76 process monoazo yes obtainable by coupling a diazo compound containing at the.

group with 3-a-mino4-cresolmethylether 3. Process of dyeing compounds ofthe group including cellulose esters and cellulose ethers consisting in usinglfor the dyeing process the monoazo dye obtainable by c'ou- 5 pling diazotized 2-chloro-l-aminobenzene-5- sulfonic acid with 3-amino-4-cresolmethylether; A

4. Compounds of the group includin celulose esters and cellulose ethers dyed wit 9o monoazo dyes obtainableb coupling a diazo compound containing at t e most one sulfo group with an ortho-aminophenolether.

5. Compounds of the group includin cellulose esters and cellulose ethers dyed wit '9; monoazo-dyes obtainable by coupling a diazo compound containing at the most one sulfo' azpfize l 2-ch1q1'o-1 aminobenZne-5-su1fbnic group -witii 3-amino-4:-cresohnethylethnt 801d Wlth 3- m0-4- r 0hne hy1eth r.

(NH zocH z (II-1 3 4;

. tures 1 5 6. Compounds of the group including c'eL, HEINZ ED l lulose esters and cellulosc-ethers dyed with I ERICH r the monogzofdye-qbtainable coupling di- 1 CARL ERICH MfiLLER.

In testimony whereof, wc-afiix our signa I 

